Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2015

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables summarize significant assets and liabilities measured at fair value in the condensed consolidated balance sheets on a recurring basis for each of the fair value levels (in thousands):



	Fair Value Measurement at Reporting Date Using
September 30, 2015	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	50,006	$	—	$	—	$	50,006
Total assets	$	50,006	$	—	$	—	$	50,006



	Fair Value Measurement at Reporting Date Using
December 31, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	60,618	$	—	$	—	$	60,618
Total assets	$	60,618	$	—	$	—	$	60,618



	Fair Value Measurement at Reporting Date Using
September 30, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	50,148	$	—	$	—	$	50,148
Total assets	$	50,148	$	—	$	—	$	50,148

Schedule of Cash and Cash Equivalents [Table Text Block]

A reconciliation of cash equivalents to consolidated cash and cash equivalents is as follows:



(in thousands)	September 30, 2015		December 31, 2014		September 30, 2014
Cash equivalents	$	50,006	$	60,618	$	50,148
Cash	171,779		195,343		117,026
Total cash and cash equivalents	$	221,785	$	255,961	$	167,174

Fair Value Measurements, Nonrecurring [Table Text Block]

The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in the condensed consolidated balance sheets are as follows:



		September 30, 2015				December 31, 2014				September 30, 2014
(in thousands)	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities	Level 1	$	88,253	$	88,313	$	102,067	$	101,808	$	102,090	$	101,711
Liabilities (including current maturities):
Senior notes payable¹	Level 3	$	200,000	$	212,919	$	200,000	$	220,226	$	200,000	$	225,186
Credit Agreement loan¹	Level 3	70,000		69,753		70,000		70,153		70,000		70,258

¹The fair values of the senior notes payable and Credit Agreement (defined in Note 11) loan are based on borrowing rates available to us for long-term loans with similar terms, average maturities, and credit risk.